ARM build fails on stable 1.5

[MagaTailor]

Using stable rust 1.5 it's the usual:

Compiling filetime v0.1.8
/home/odroid/.cargo-1.5/registry/src/github.com-48ad6e4054423464/filetime-0.1.8/src/lib.rs:222:19: 222:29 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/odroid/.cargo-1.5/registry/src/github.com-48ad6e4054423464/filetime-0.1.8/src/lib.rs:222         if utimes(p.as_ptr(), times.as_ptr()) == 0 {
                                                                                                                 ^~~~~~~~~~
/home/odroid/.cargo-1.5/registry/src/github.com-48ad6e4054423464/filetime-0.1.8/src/lib.rs:222:19: 222

[MagaTailor]

Same for git2-0.3.3 and curl-0.2.14

In other words, cargo doesn't build on stable 1.5 due to those broken crates.

EDIT: at least nightly 1.7 seems to be compatible

[SimonSapin]

Does it build on 1.5 when changing the libc dependency to 0.1?

[SimonSapin]

@alexcrichton Could a build script conditionally decide add dependencies? (Or in this case, change the dependency version based on rustc version.)

[alexcrichton]

Ah for now I'll just add some casts, thanks for the report!

[MagaTailor]

Yeah, that particular cast originally allowed me to find out about the other two crates. What about those?

[alexcrichton]

Yeah I'm working on those as well